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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 2,072,518	$ 1,044,914	$ 1,294,817	$ 1,486,395
Sales and other transfers	0	(1)	0	(108)
Recognized on the sale of residential mortgage loans	66,420	22,096	136,482	37,785
Purchase of MSRs	36,153	32,249	806,469	78,994
Servicing transfers and adjustments	(4,706)	16	(6,840)	(263,427)
Changes in fair value:
Changes in valuation inputs or assumptions	74,819	8,765	120,438	(142,707)
Realization of expected cash flows	(68,944)	(39,026)	(175,106)	(127,919)
Ending balance	2,176,260	1,069,013	2,176,260	1,069,013
Fair Value Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	1,408,420	305,085	578,957	714,006
Sales and other transfers	0	0	0	0
Recognized on the sale of residential mortgage loans	66,420	22,096	136,482	37,785
Purchase of MSRs	36,153	32,249	806,469	78,994
Servicing transfers and adjustments	17	16	73	(263,830)
Changes in fair value:
Changes in valuation inputs or assumptions	6,983	(4,731)	47,132	(166,546)
Realization of expected cash flows	(38,186)	(15,051)	(89,306)	(60,745)
Ending balance	1,479,807	339,664	1,479,807	339,664
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	664,098	739,829	715,860	772,389
Sales and other transfers	0	(1)	0	(108)
Recognized on the sale of residential mortgage loans	0	0	0	0
Purchase of MSRs	0	0	0	0
Servicing transfers and adjustments	(4,723)	0	(6,913)	403
Changes in fair value:
Changes in valuation inputs or assumptions	67,836	13,496	73,306	23,839
Realization of expected cash flows	(30,758)	(23,975)	(85,800)	(67,174)
Ending balance	$ 696,453	$ 729,349	$ 696,453	$ 729,349

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- Definition

Servicing assets at fair value, additions recognized from mortgage sales.

+ References

No definition available.

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(i)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746

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- Definition

Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746

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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(ii)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746

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Amount of increase (decrease) in fair value from changes classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 50
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-Paragraph 3
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